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2)a³+2a-a²+3a²-10a³+5= -9a³+2a² +2a +5
3)5x²-x²+y²+y-3-y+(-2)y²+5=4x² -y² +2
4)13x+7y-10x-4y+5y=3x +8y
5)90x+3y-x²-9*9x-2y+x²= 9x+y
b)= -10a³ + 2a - 2a² +5
c) = 4x² - 2y² - 2
d) = 3x + 8y
e) = 9x + y
2)a³+2a-a²+3a²-10a³+5= -9a3+2a+2a2+5
3)5x²-x²+y²+y-3-y+(-2)y²+5= 4x2 -y2+2
4)13x+7y-10x-4y+5y=3x+8y
5)90x+3y-x²-9*9x-2y+x²=9x+y